For which actinoid does the formal filling of the 5f subshell commence according to the text? - d and f BLOCK ELEMENTS Quiz | GKFix.in

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Question

For which actinoid does the formal filling of the 5f subshell commence according to the text?

A. Actinium (Ac)
B. Thorium (Th)
C. Protactinium (Pa)
D. Uranium (U)